MIL-HDBK-1897(AT)
FIGURE 13. Tolerances for investment castings with in-line holes.
5.1.11.11 Finish stock in hole. Finish stock allowance of 0.010 to 0.015 inch per side is required for grinding or reaming a hole, provided that the section around the hole is uniform. For holes over 1 inch in diameter, sufficient stock should be allowed to maintain required tolerance and also guarantee "clean-up". If section around hole is not uniform, more finish stock will be required as heavier section tends to pull hole out of round (see figure 14).
FIGURE 14. Potential out-of-roundness in an irregular mass.
5.1.11.12 Hole relationships.
5.1.11.12.1 Distance between holes. Tolerances for various interhole distances are shown in figure 15.
15
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